package com.sky.service.impl;

import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import com.alibaba.fastjson.JSON;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;
    // 微信服务接口地址
    private static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
//    private HttpClientUtil httpClientUtil = new HttpClientUtil();

    @Autowired
    private WeChatProperties properties;
    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User weixinlogin(UserLoginDTO userLoginDTO) {
        // 调取接口服务，获取openid
        String openid = getOpenid(userLoginDTO.getCode());

        // 有没有获取到，空为登录失败
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        // 合法用户，判断是否为新用户，
        User user = userMapper.getUserByOpenId(openid);
        
        // 如果是新用户，自动完成注册
        if(user == null){
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        // 返回用户对象User
        return user;
    }

    /**
     * 调取接口服务，获取openid
     * @param code
     * @return
     */
    private String getOpenid(String code) {
        // 调用微信服务器接口，获取openid
        Map<String, String> map = new HashMap<>();
        map.put("appid", properties.getAppid());
        map.put("secret", properties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject obj = JSONUtil.parseObj(json);
        log.info("得到的json:{}", obj);
        String openid = obj.getStr("openid");
        return openid;
    }
}
